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汽車(che)的(de)驅(qu)(qu)(qu)(qu)動(dong)(dong)(dong)形式(shi)一般有以下幾種(zhong)：前置(zhi)(zhi)后(hou)(hou)驅(qu)(qu)(qu)(qu)(FR)、前置(zhi)(zhi)前驅(qu)(qu)(qu)(qu)(FF)、后(hou)(hou)置(zhi)(zhi)后(hou)(hou)驅(qu)(qu)(qu)(qu)(RR)、中(zhong)置(zhi)(zhi)后(hou)(hou)驅(qu)(qu)(qu)(qu)(MR)、四(si)輪(lun)驅(qu)(qu)(qu)(qu)動(dong)(dong)(dong)。所(suo)謂驅(qu)(qu)(qu)(qu)動(dong)(dong)(dong)形式(shi)，是指(zhi)發動(dong)(dong)(dong)機的(de)布置(zhi)(zhi)方式(shi)及驅(qu)(qu)(qu)(qu)動(dong)(dong)(dong)輪(lun)的(de)數(shu)量、位(wei)置(zhi)(zhi)的(de)形式(shi)。國內外大多數(shu)貨(huo)車(che)(含皮卡)、部(bu)分轎(jiao)車(che)(尤(you)其是高級轎(jiao)車(che))和部(bu)分客車(che)都采用前置(zhi)(zhi)后(hou)(hou)驅(qu)(qu)(qu)(qu)的(de)驅(qu)(qu)(qu)(qu)動(dong)(dong)(dong)型(xing)式(shi)，但采用該型(xing)式(shi)的(de)小型(xing)車(che)很(hen)少。所(suo)謂全輪(lun)驅(qu)(qu)(qu)(qu)動(dong)(dong)(dong)，又稱四(si)輪(lun)驅(qu)(qu)(qu)(qu)動(dong)(dong)(dong)，是指(zhi)汽車(che)前后(hou)(hou)輪(lun)都有動(dong)(dong)(dong)力。一般用4X4或4WD來表示(shi)，如果你看見一輛車(che)上標(biao)有上述字樣，那就(jiu)表示(shi)該車(che)輛擁有4輪(lun)驅(qu)(qu)(qu)(qu)動(dong)(dong)(dong)的(de)功能。

分(fen)(fen)時(shi)(shi)(shi)驅(qu)動(dong)(dong)(dong)(dong)分(fen)(fen)時(shi)(shi)(shi)驅(qu)動(dong)(dong)(dong)(dong)就是(shi)由駕(jia)(jia)駛(shi)員根據路(lu)(lu)面(mian)(mian)情(qing)況(kuang)(kuang)，選(xuan)擇四驅(qu)或者(zhe)兩(liang)驅(qu)，這也是(shi)一(yi)般越野車(che)或四驅(qu)SUV 常見的(de)驅(qu)動(dong)(dong)(dong)(dong)模(mo)式(shi)。分(fen)(fen)時(shi)(shi)(shi)驅(qu)動(dong)(dong)(dong)(dong)較大(da)的(de)特點(dian)就是(shi)人工操作(zuo)，由駕(jia)(jia)駛(shi)員根據路(lu)(lu)面(mian)(mian)情(qing)況(kuang)(kuang)通(tong)過接通(tong)或斷開分(fen)(fen)動(dong)(dong)(dong)(dong)器(qi)來(lai)變化(hua)兩(liang)輪(lun)驅(qu)動(dong)(dong)(dong)(dong)或四輪(lun)驅(qu)動(dong)(dong)(dong)(dong)模(mo)式(shi)，較大(da)的(de)優點(dian)就是(shi)可以(yi)根據實際情(qing)況(kuang)(kuang)來(lai)選(xuan)取(qu)(qu)驅(qu)動(dong)(dong)(dong)(dong)模(mo)式(shi)，比(bi)較經(jing)濟。就拿普通(tong)的(de)越野車(che)而言，一(yi)般都(dou)有(you)三(san)種(zhong)驅(qu)動(dong)(dong)(dong)(dong)模(mo)式(shi)可以(yi)選(xuan)擇：在(zai)公路(lu)(lu)上行駛(shi)使(shi)用(yong)2H 高速(su)(su)兩(liang)輪(lun)驅(qu)動(dong)(dong)(dong)(dong)檔，當(dang)遇到雨雪路(lu)(lu)況(kuang)(kuang)時(shi)(shi)(shi)選(xuan)擇4H 高速(su)(su)驅(qu)動(dong)(dong)(dong)(dong)增(zeng)強(qiang)車(che)輛(liang)的(de)附(fu)著力和操控(kong)性，而面(mian)(mian)對(dui)惡(e)劣路(lu)(lu)況(kuang)(kuang)的(de)挑戰時(shi)(shi)(shi)又可采用(yong)4L 低速(su)(su)四輪(lun)驅(qu)動(dong)(dong)(dong)(dong)，使(shi)動(dong)(dong)(dong)(dong)力作(zuo)用(yong)在(zai)全部四個(ge)車(che)輪(lun)上，從而降(jiang)低了對(dui)每個(ge)輪(lun)胎附(fu)著力的(de)要求，減小了轉(zhuan)彎時(shi)(shi)(shi)車(che)輪(lun)空(kong)轉(zhuan)的(de)幾率，發動(dong)(dong)(dong)(dong)機(ji)制(zhi)動(dong)(dong)(dong)(dong)能力也得(de)以(yi)增(zeng)強(qiang)，極大(da)地提高了車(che)輛(liang)在(zai)崎嶇或光(guang)滑路(lu)(lu)面(mian)(mian)行駛(shi)時(shi)(shi)(shi)在(zai)油門突然關閉(bi)的(de)情(qing)況(kuang)(kuang)下(xia)的(de)可控(kong)性。優點(dian)是(shi)可根據實際情(qing)況(kuang)(kuang)來(lai)選(xuan)取(qu)(qu)驅(qu)動(dong)(dong)(dong)(dong)模(mo)式(shi)，比(bi)較經(jing)濟；缺點(dian)是(shi)其(qi)機(ji)械(xie)結構比(bi)較復雜，駕(jia)(jia)駛(shi)員要具有(you)一(yi)定的(de)經(jing)驗才能掌握好(hao)切換時(shi)(shi)(shi)機(ji)。

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支重輪的作用

是挖掘機與推土機底盤四輪一帶中(zhong)的(de)一(yi)種，它的(de)主要(yao)作用是支撐著挖掘機與推土機的(de)重量(liang)，讓履帶沿著輪(lun)子前進。